More Illustrations of Alchemy as Sacred Sex?

I see at least two illustrations of nude embracing couples here. It seems entirely plausible to me that, as Weor emphasizes, alchemy was -- at least in part -- the pursuit of transmuting the lead of lust into the gold of enlightenment.

Steiner and Manly stated that there are approaches to raising one's spirituality and abilities that they were not allowed to share. I wager that they were hinting at 'physical alchemy.'